Fig. 2.3 Thermal physiological assessment of the thermal environment. PMV Predicted Mean Vote, PT* Perceived Temperature, PET Physiological Equivalent Temperature, OUT_SET* Outdoor Standard Effective Temperature, AT Apparent Temperature, WCT Wind Chill Temperature, Tsk mean skin temperature, SR sweat rate, Esk evaporative heat loss, Wsk wetness of the skin, Icl insulation value of clothing clo, Ta air temperature, Tmrt mean radiant temperature, v wind velocity, e water vapour pressure service DWD (Deutscher Wetterdienst) with the output parameter "perceived temperature, PT" (Staiger et al. 1997) that considers a certain degree of adaptation by various clothing. This procedure is running operationally taking quantitatively the acclimatisation approach HeRATE (Koppe and Jendritzky 2005) into account. HeRATE is a conceptual model of short-term acclimatisation that modifies absolute PT thresholds by superimposition of the (relative) experience of the population in terms of PT of the previous weeks (Fig. 2.4). This procedure has the advantage that the index can be used without modification in different climate regions and during different times of the year without the need to artificially define seasons and to calibrate it to a particular city. Nevertheless, to date the German weather service (DWD) is the only national weather service to run a complete heat budget model (Klima-Michel-model) on a routine basis specifically for its applications in human biometeorology.
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.